SCH3112I-NE SMSC [SMSC Corporation], SCH3112I-NE Datasheet - Page 394

• Manufacturer Part Number: SCH3112I-NE
• Description: LPC IO with 8042 KBC, Reset Generation, HWM and Multiple Serial Ports
• Manufacturer: SMSC [SMSC Corporation]

Rev 0.2 (09-28-04)
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To put the chip in the first XNOR chain test mode, tie LAD0 and LFRAME# low. Then toggle
PCI_RESET# from a low to a high state. Once the chip is put into XNOR chain test mode, LAD0 and
LFRAME# become part of the chain.
To exit the SIO XNOR chain test mode tie LAD0 or LFRAME# high. Then toggle PCI_RESET# from
a low to a high state. A VCC POR will also cause the XNOR chain test mode to be exited. To verify
the test mode has been exited, observe the output at TXD1. Toggling any of the input pins in the chain
should not cause its state to change.
Setup of Super I/O XNOR Chain
Warning: Ensure power supply is off during setup.
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Testing
1. Turn power on.
2. With LAD0 and LFRAME# low, bring PCI_RESET# high. The chip is now in XNOR chain test mode.
3. Bring pin 110 high. The output on TXD1 (pin66) should go toggle. Refer to STEP ONE in
4. In descending pin order, bring each input high. The output should switch states each time an input
5. The current state of the chip is now represented by INITIAL CONFIG in
6. Each input should now be brought low, starting at pin one and continuing in ascending order.
7. To exit test mode, tie LAD0 (pin 19) OR LFRAME# high, and toggle PCI_RESET# from a low to a
TXD1 This is the chain output.
PCI_RESET#.
Connect the VSS, the AVSS, HVSS pins to ground.
Connect the VCC, the VTR, and HVTR pins to 3.3V.
Connect an oscilloscope or voltmeter to TXD1.
All other pins should be tied to ground.
At this point, all inputs to the first XNOR chain are low. The output, on TXD1 should also be low.
Refer to INITIAL CONFIG on
is toggled. Continue until all inputs are high. The output on TXD1 should now be low. Refer to
END CONFIG in
Continue until all inputs are low. The output on TXD1 should now be low. Refer to
high state.
Table
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Table
DATASHEET
LPC IO with 8042 KBC, Reset Generation, HWM and Multiple Serial Ports
C.1.
378
Table
C.2.
SMSC SCH311X
Table
Table
Datasheet
C.2.
C.1.